My first tiling job was mosaics in my kitchen, their not difficult to do, just as everyone else has said more time consuming really.
One good tip that someone on here once said, if you're going to be doing mosaics a bit in the large
tile format it is useful to have or make up a flat square wooden board, say 30cm x 30cm, attach on a cut to size piece of carpet or similar as a cussion and stick a handle on the back to use to flattern out the mosaic tiles level.
Nothing like trying to apply even pressure on large floppy mosaics using your hands and trying to get them even.
Cutting them on a wetcutter or even snips I find easy to do, but the longest part is just cleaning the adhesive away from the millions of grout lines that come seeping through if you press on too firmly.
So really, charge more for mosaics mainly for the labour of cleaning them up and grouting than anything.